Transformer casing



Sept. 9, 1924. 1,508,201

E. D. TREANOR TRANSFORMER CASING Filed July 22 21 Inventor:

Edward DTreanor:

ls Attorney.

Patented se 9, 1924. g

UNITED STATES PATENT OFFICE.

ZD. TREANOR, OF PITTSI'IELD, MASSACHUSFIJFJ'.S, ASSIGNOR TO GENERAL ELECTBIC COMPANY, A CORPORATION OF NEW YORK.

rmsronmnn CASING;

Application filed July 22,

To all wlzlom it may concern Be it known that I, EDWARD D. TREANOR,

' a citizen of the United States, residing at which the transformers are immersed. The

insulation and cooling of transformers is commonly made more efl'ective by immersion in a suitable insulating liquid. The general object of the invention is to provide an improved casing of simple construction adapted to hold and protect from contamination the liquid in which a transformer is immersed. Various advantages will appear from the following description.

One embodiment 'of the invention is shown in the accompanying drawing which is a view of a transformer casing made in accordance with the invention.

In the particular arrangement shown in the drawing a casing 1 has a diaphragm 2 sealed to the wall of the casing to provide a liquid tight compartment 3 for a transformer 4. The casing 1 has ,a cover 5 which is made double to enclose a space or compartment 6, thepurpose of which will appear later. The transformer compartment 3 and the space or com artment 6 within the cover 5 are connecte by a flexible tube or pipe 7 which may be of lead, the diaphragm 2 and the under side of the cover 5 bping separated a short distance, the s ace 8 therebetween accommodating the pipe 7. One terminal 9 of the transformer is show as being connected to an external lead 10 through a bushing 11 mounted in'the diaphra m 2. Other transformer terminals may e brought out in similar manner if desired. The external lead 10 is carried throu h a bushing in the side wall of the casm so as not to interfere with removal of t e cover 5.

Insulating liquid such as oil is introduced into the compartment 6 through an opening 12 in the. top of the cover, some of this liquid flowing on through the pipe 7 into the transformer compartment 3. Enou h liquid is introduced to fillcompletely t e pipe7 and the space around the transformer in the transformer compartment 3 and to 1922. Serial no; 576,665.

fill partially the compartment 6 in the cover as shown in the drawing. As the transformer compartment 3 is completely filled with the insulating liquid, no air can comeinto contact with the liquid in this compartment to oxidize or otherwise contaminate it or to form explosive mixtures with its vapor. The expansion and contraction of the liquid in the transformer compartment 3 due to variations in temperature as the load on the transformer is change-:1 cause a flow of liquid through the pipe 7 to and from the compartment 6 in the cover, this latter compartment thus serving as an expansion compartment. Undue pressure of the liquid is thus avoided within the easing and the transformer compartment is kept completely full of liquid at all times. The pipe 7 is preferably extended slightly above thebottom of the expansion compartment 6 so that moisture and sediment settling in this compartment will be retained therein without passing ,on into the transformer compartment. Such moisture and sediment may be drawn oil when desired through the drain 13.

A pipe 14 connects the space or compartment 8 under the cover with the space above the liquid in the expansion compartment 6 and the opening 12 in the cover is preferably closed tightly by a cap 15. This permits an interchange of air between the compartment 8 and the expansion compartment 6 as the level of the liquid in the latter compartment is raised and lowered. This assures that any air coming into contact with the liquid in the expansion chamber 6 can come onl from the compartment 8 where it is warme' and dried by the heat generated in the transformer and where it is protected from outside moisture and dust.

The cover 5 is preferably hinged to the body of the casing as by the hinge 16 so that it may be tip ed up as indicated by dotted lines in the diawing. This gives easy access to the connections at thebushings 11. I It is obvious thatithe cover may be raised without removing any of the insulatin liquid from the casing, the flexibility o the pipe 7 allowing it to accommodate itself to the movement of the cover. The pipe 7 is of course long enough to reach the cover in its raised position.

The invention rovides a construction which is. self contained, and easily handled and installed, and which is simple and efficient for the purposes for which it is intended.

What I claim as new and desire to secure by Letters Patent of the United States is an expansion compartment spaced above said v transformer compartment, 'a' flexible pipe connecting said compartments, insulating fluid within said transformer compartment and extending through the pipe into the expansion compartment, and means providing communication between said'expansion compartment and the space between the expansion and transformer compartments.

3. A transformer casing including a body portion having a transformer compartment, a hollow cover therefor, a flexible pipe connecting the transformer compartment with the space within thehollow ,cover, andinsulating fluid within the transformer comartment and extendin through said pipe -1nto the space within. t e cover.

tending through said pipe into the space" within the cover.

the transformer compartment and extending through said pipe into the space in the hollow cover, and a pipe connecting the space between the cover and diaphragm with the space above the liquid in the hollow cover.

In witness whereof, I have hereunto set my hand this 18th day of July 1922.

I EDWARD D. TREANOR. 

